![]() Why is andesitic lava viscous?Īndesitic lava is an example of a high viscosity lava whereas balastic lava has a low viscosity, so is more runny. Due to the higher viscosity of magmas erupted from these volcanoes, they are usually more explosive than shield volcanoes. What type of volcano rhyolitic andesitic or basaltic is the most explosive? Lavas and pyroclastics are usually andesitic to rhyolitic in composition. Is andesitic or rhyolitic more explosive? Granitic, or rhyolitic, magmas and andesitic magmas are generated at convergent plate boundaries where the oceanic lithosphere (the outer layer of Earth composed of the crust and upper mantle) is subducted so that its edge is positioned below the edge of the continental plate or another oceanic plate. Lava Domes or Volcanic Domes – result from the extrusion of highly viscous, gas poor andesitic and rhyolitic lava. Siliceous Lava Flows – High viscosity andesitic and rhyolitic lava flows, because they can’t flow very easily, form thick stubby flows that don’t move far from the vent. The flow moves by the injection of lobes of lava into the collar of blocky rubble that comprises the flow front. What is the interior of an andesite volcano composed of?Īlthough detached blocks occur on the tops of andesite flows, the flow interior is composed of massive lava which grades downward into an autobrecciated (self-fragmented) basal layer.Is andesitic or rhyolitic more explosive?. ![]() ![]()
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